Method of coiling strip-formed material and a means for carrying out the method

ABSTRACT

For coiling a strip-formed material issuing from an extruder, a hollow drum is provided against the inner wall of which the extruded material is fed and which rotates at a speed substantially the same as the speed of the extruded material. Within the outer drum is an inner drum which is stationary or rotates independently of the outer drum. When the supply of material suddenly ceases, the material coils around the second drum without being subjected to damaging strains.

United States Patent 1 m1 ,880,376 Svensson Apr. 29, 1975 METHOD OFCOILING STRIP-FORMED 1.822.589 9/1931 George et a]. 242/83 MATERIAL ANDA MEANS FOR CARRYING L' F 242/2 CWIS. l i i 4 r r OUT THE METHOD2.892.899 6/1959 Conncll 242/83 X [75] Inventor: Lennart Svensson,Vasteras. Sweden 5 .2 I /19 Krzl t t u 2 2/83 X [73] Assignee: AllmannaSvenska Elektriska Akfiebolage'i vilslems- Swede" PrimaryExaminerStanley N. Gilreath [22] Filed: Feb. 14, i973 [211 App]. No.1332,381

[57] ABSTRACT [30] Foreign Application Prim-y Dam For coiling astrip-formed material issuing from an ex- MLll'. 3. SWBdCIl r i truder ahollow drum is provided against the inner wall of which the extrudedmaterial is fed and which U-S. Cl. t t i i r t rotates at a peedubstantially the ame as the peed I t of the extruded materiaL the uterdrum is an Fleld 0 Search 83, 78, 8i inner drum is tationary ()r rotatesindepen- 242/84. 79, 47. 54 R. ll7; 72/135. l42. I46 dently of the outerdrum. When the supply of material suddenly causes, the material coilsaround the second References Ciled drum without being subjected todamaging strains.

UNITED STATES PATENTS 302.362 7/1884 Sweet 242/83 7 Claims. 3 DrawingFigures d 3O ,7 /5 29 I6 34 25 23 a p F r )S///////////// 5' I 9 METHODOF COILING STRIP-FORMED MATERIAL AND A MEANS FOR CARRYING OUT THE METHODBACKGROUND OF THE INVENTION 1. Field of the Invention The presentinvention relates to a method of coiling strip-formed material. by whichis meant wire. strip and tubes. and a means for carrying out the method.The invention is particularly valuable for coiling material inhydrostatic extrusion. which is a method in which the manufacturedproduct leaves the press at a great speed and suddenly stops at the endof the pressing cycle. It is particularly suitable forcoiling-thin-walled tubes. which are easily deformed.

2. The Prior Art Strip-formed material can be gathered up in stationarybarrels or on rotating drums. When it is gathered in stationary barrels.the material will be rotated one turn around its own axis for each turnin the barrel. For thin wire this causes no inconvenience or problems.For material with a cross section which is not round or tubes. thisrotation around the longitudinal axis cannot. as a rule. be tolerated.The material must be coiled on a rotating drum.

In hydrostatic extrusion a strip-formed product. wire. profile or tube.is shaped with the desired cross section since the material in a billet.which is enclosed in a pressure chamber. is subjected to a highhydrostatic pressure and in this way pressed out through an opening in adie. The shaped product leaves the die at a high speed. which may be ofthe order of IS m/sec. when manufacturing copper tubing. The tube lengthwhich can be obtained from a billet depends on the size of the billetand the cross section of the tube and can be from 300 to 400 metres. Thepressing process is interrupted before the billet is completelyconsumed. When the pressing is interrupted. the material flow throughthe die ceases almost instantaneously. This circumstance makes itdifficult to coil the product especially when this is a tube which iseasily deformed. Known coiling devices with a rotating drum of knownkind must be stopped exactly when the extrusion ceases. in order toavoid a jerk or stretching of the product which causes damage. Thisrefers particularly to extrusion of thinwalled tubes.

SUMMARY OF THE INVENTION According to the invention the problem issolved by inserting the product. a rod. wire or a tube. tangentiallyinto a first hollow drum. the inner surface of which has a peripheralspeed which is substantially the same as the speed of the incomingproduct. The product is wound up inside the drum. thus on an innercoiling surface. Inside this drum there is a second drum having an outercoiling surface. This drum is rotatable independently of the first drum.It is normally stationary when a product is wound up in the first drum.When the extrusion is finished and the supply of the press productsuddenly ceases. the product is stretched because of the rotation of thefirst. outer drum and will thus be coiled up on the inner drum withoutbeing subjected to damaging strains. Thus. the rotation of the outerdrum does not have to be synchronized with the pressing. A rapid brakingis not necessary. When. after the extrusion. the product has beenseparated from the residual billet remaining in the pressure chamber.the part of the product which is between the drum and the press is woundon by putting the second. innner drum in rotation.

The invention also relates to a means for carrying out the method. Saidmeans comprises a first hollow rotatable drum. having an inner coilingsurface. and a second drum. having an outer coiling surface. The seconddrum is arranged inside the first drum and is rotatable. as a rule. forwinding on the last part of a press product. The equipment of coursecomprises driving devices and handling devices of various kinds.

BRIEF DESCRIPTION OF THE DRAWING The invention will be further describedwith reference to the accompanying drawings. FIG. I shows in sectionequipment in which the inner drum with wound-on material is lifted outof the outer drum when a coil of material is to be removed. FIG. 2 showsequipment in which a coil of material is deposited on a transport car.FIG. 3 shows in a larger scale supporting member for a coil in theembodiment of FIG. I.

DESCRIPTION OF THE PREFERRED EMBODIMENT In the figures. I designates aconical hollow drum having an inner coiling surface 2. It is supportedby a disc 3 with a hub 4 and is rotatably mounted by bearings 7 torotate around a pin 5, which is fixed to the floor 6. The drum is drivenby a motor 8 through the gear wheel 9 on the motor shaft 10 and a gearwheel I I on the hub 4. Inside this drum there is a second drum I5having an outer coiling surface I6. The drum is provided with discs 17and I8 and at its lower part with a hub [9. It is mounted on the pin 5by bearings 20 and is driven quite independently of the drum 1 by amotor 22 which is connected to the drum by means of a gear drive havinga gear wheel 23 on the motor shaft 24 and a rim gear 25 on the hub I9.In the disc 18 a number of collapsible supporting members 26 aremounted. The inner drum I5 can be lifted out of the outer drum by meansof a lifting device. shown as a lifting cylinder 27 with a lifting bar28 which is connected to the disc I7. Between a plate 29 on the bar 28and the disc 17 is a bearing 30. Thus. the drum can rotate in relationto the bar 28 in the position shown as well as in an elevated position.A car 31 running on rails 32 can be pushed in below the drum I5 whenthis is in its elevated position. A guide tube 33 for a press product 34is located and shaped in such a way that the press product is insertedtangentially into the outer drum 1.

The supporting member 26 is shown in a larger scale in FIG. 3. It isjournalled upon a pin in a slot 76 in the bottom disc I8. It is lockedin the position shown by means of latch 77 journalled upon a pin 78between two brackets 79. This latch is operated by an operating cylinder80 which is fixed to the bottom disc 18 and attached to the latch 77 bymeans of its operating rod 8|. When the latch 77 is withdrawn by thecylinder 80. the coiled product 34 will tilt the member 26 within theslot 76 and fall down upon a car 3I moved into a position below a lifteddrum.

In FIG. 2. 4] designates a conical drum having an inner coiling surface42. It is suspended in a conical disc 43 which is rotatably mounted in aring 44 by a bearing 45. The ring 44 is suspended on the underneath sideof the floor 46. The drum is driven by a motor 47 through the V-belt 48running over the grooved pulley 49 on the shaft 50 of the motor 47 andover the scored pulley S] of the drum 41. inside the drum 41 is a seconddrum 52 having an outer coiling surface 53. This drum is suspended withthe discs 54 and 55 on a shaft 56 which is mounted in the hub 57 in thefloor 46 by bearings 58. It is connected to the driving motor 59 bymeans of the gear wheel 60 on the motor shaft 6] and the gear wheel 62on the shaft 56. The drum 52 is pro- \ided at its lower part with anumber of radially manoeuvrable coil supports 65 \\hich are mounted inslits 66 in the drum S2 and in slits 67 in the ring 68. which issuspended in the disc 55. The supports 65 can he operated radiallybetween the position shown in the figure and a retracted position bymeans of an operating device 69 such as a hydraulic cylinder. A pressproduct 70 is inserted tangentially into the drum 4! by means of a guidetube 7] which passes the opening 72 in the floor 46 and the ring 44.Below the drums a transport car 73 for a coil of material is shown. Thecar runs on rails 74. The coiling means operates in the following way.The outer drum 1 or 41. is brought to rotate at such a speed that thecoiling surface 2 or 42 will attain a peripheral speed which correspondsto the inlet speed of the press product 34 or 70. The press product willlay itself on the inner coiling surface 2 or 42. When the extrusion isfinished. the outer drum continues to rotate but the supply of the pressproduct ceases. The press product 34 or 70 is firmly connected with theresidual billet in the pressure chamber. and its movement is thereforestopped instantaneously. The press product nearest the guide tube 33 or7] is stretched. which means that the diameter is reduced and that itwill lay itself around the inner drum and successively be completelycoiled on this drum. The forces acting on the press product will besmall and the risks of the product being damaged. for example byflattening. stretching or tearing. are eliminated. When the product hasbeen cut offat the press outlet. the inner drum is started. and the partof the press product which is located between the drum or 52 and thepress is coiled on. After this. the coil of material is removed. In theembodiment according to FIG. I. the inner drum [5 is lifted up by meansof the lifting device 27. the car 31 is run in under the drum and thesupporting members 26 are released. en-

abling the coil to fall down freely on to the car 31. ln the embodimentaccording to FIG. 2. the coil supports are retracted with the help ofthe operating devices 69 and the coil falls down on the car 73.

I claim:

l. Method of coiling strip-formed material which comprises leading thematerial tangentially into and coiling it inside a first hollow drumrotating at such a speed that its peripheral speed is substantially thesame as the speed of the material. suddenly ceasing the supply ofmaterial. and thereafter coiling the material around a second drumarranged inside the first drum. said second drum being stationary orrotating at a low speed.

2. Means for coiling strip-formed material comprising a first hollowrotatable drum having an inner coiling surface and a second drum withinthe first drum and spaced therefrom having an outer coiling surface.means mounting said drums for rotation about substantially coincidentaxes. said drums providing a space therebctween opening axially into thespace between the drums. means for guiding strip-formed material intosuch space against the inner surface of the first drum independently ofthe drums. and means to rotate the first and second drum independentlyof each other.

3. Means as claimed in claim 2. in which the drums rotate about avertical axis and the outer drum has upper and lower parts. and theguiding means guides the material substantially tangentially against theinner surface of the upper part of the first drum.

4. Means as claimed in claim 3. in which the first drum is conical.

5. Means as claimed in claim 4. in which the lower part of the firstdrum has the largest diameter.

6. Means according to claim 5. in which the first drum is provided atits lower part with inwardly projecting supporting members for thecoiled-up material preventing the material from falling out of the drum.

7. Means according to claim 6. in which the second drum is provided withmovably arranged supporting members for a coil. which supporting membersare collapsible or retractable so that a coil on the second drum canunimpededly pass the supporting members axially.

1. Method of coiling strip-formed material which comprises leading thematerial tangentially into and coiling it inside a first hollow drumrotating at such a speed that its peripheral speed is substantially thesame as the speed of the material, suddenly ceasing the supply ofmaterial, and thereafter coiling the material around a second drumarranged inside the first drum, said second drum being stationary orrotating at a low speed.
 2. Means for coiling strip-formed materialcomprising a first hollow rotatable drum having an inner coiling surfaceand a second drum within the first drum and spaced therefrom having anouter coiling surface, means mounting said drums for rotation aboutsubstantially coincident axes, said drums providing a space therebetweenopening axially into the space between the drums, means for guidingstrip-formed material into such space against the inner surface of thefirst drum independently of the drums, and means to rotate the first andsecond drum independently of each other.
 3. Means as claimed in claim 2,in which the drums rotate about a vertical axis and the outer drum hasupper and lower parts, and the guiding means guides the materialsubstantially tangentially against the inner surface of the upper partof the first drum.
 4. Means as claimed in claim 3, in which the firstdrum is conical.
 5. Means as claimed in claim 4, in which the lower partof the first drum has the largest diameter.
 6. Means according to claim5, in which the first drum is provided at its lower part with inwardlyprojecting supporting members for the coiled-up material preventing themateRial from falling out of the drum.
 7. Means according to claim 6, inwhich the second drum is provided with movably arranged supportingmembers for a coil, which supporting members are collapsible orretractable so that a coil on the second drum can unimpededly pass thesupporting members axially.